#include"Mystdio.h"

#include<unistd.h>

#define myfile "test.txt"

 int main()
{
  _FILE *fp = _fopen(myfile,"a");
  if(fp == NULL) return 1;
  const char *msg = "hello world\n";
  int cnt = 10;
  while(cnt)
  {
    _fwrite(fp,msg,strlen(msg));

    sleep(1);
    cnt--;
  }
  _fclose(fp);
  return 0;
}
